CN113567850B - System and method for verifying switching-on/off performance of medium-low voltage direct current distribution switchgear - Google Patents
System and method for verifying switching-on/off performance of medium-low voltage direct current distribution switchgear Download PDFInfo
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- CN113567850B CN113567850B CN202110852982.7A CN202110852982A CN113567850B CN 113567850 B CN113567850 B CN 113567850B CN 202110852982 A CN202110852982 A CN 202110852982A CN 113567850 B CN113567850 B CN 113567850B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a system and a method for verifying the switching-on and switching-off performance of medium-low voltage direct current distribution switchgear, wherein the system comprises a current source, a voltage source, a test article, a current and voltage measuring system; the current source comprises a direct current charging device, a charging switch, a current source capacitor bank, a current source reactor, a current source resistor, a current source discharging switch, a current source protection switch, a current source closing switch, a current source protection ball gap and a current source protection lightning arrester; the voltage source comprises a direct current power supply, a voltage source closing switch, a voltage source frequency modulation resistor and a voltage source frequency modulation capacitor; the test article is a tested direct current switch; the current and voltage measuring system comprises a voltage measuring device and a current measuring device. The test method of the system evaluates the short-circuit current breaking capacity of the medium-low voltage direct current distribution switch and the medium strength recovery capacity after the current breaking. Meanwhile, the large-capacity direct test function is realized, the investment of a laboratory is saved, and the equivalent and economic purposes are achieved.
Description
Technical Field
The invention belongs to the technical field of tests of medium and low voltage direct current distribution switchgear. Relates to a system and a method for verifying the on-off performance of medium and low voltage direct current distribution switchgear.
Background
Dc switching devices are the most direct and economical way to break a dc line fault. Because the direct current system has no natural zero crossing point, the short-circuit fault impedance is small, the rising speed of the short-circuit current is high, the direct current switch device needs to cut off the fault current within a few milliseconds, and the energy stored in the system inductor is dissipated, so that high requirements on the cut-off performance of the direct current switch device are provided. In order to verify the switching-on and switching-off performance of the direct-current switching equipment, a method for providing fault current by an LC (inductance-capacitance) oscillating circuit is generally adopted in laboratories at present, but the insulation performance and the dielectric strength recovery capability of the direct-current switching equipment after switching-on and switching-off are not examined because only one power supply for providing current is provided.
Patent document CN110161405a discloses a three-power-supply dc on-off synthesis test loop and a test method thereof, which is a dc on-off test method that, on the basis of a conventional dc on-off test loop formed by a current source and a commutation source, a newly added recovery voltage source provides an equivalent TRV amplitude value and a continuous action thereof, and the current source, the commutation source and the recovery voltage source are controlled according to a preset time sequence to provide a large current and a high voltage for a test sample switch, thereby providing equivalent test parameters. The circuit and the method only check the main branch switch of the DC circuit breaker finally, and do not check the whole breaking performance of the DC circuit breaker test sample, and have insufficient equivalence.
Patent document CN104535923A discloses a test circuit and a test method for detecting the breaking performance of a dc circuit breaker, the circuit includes a current source and a test circuit part connected to the current source, wherein the current source is outputted from a capacitor of a low-frequency oscillation circuit (or a high-frequency oscillation circuit) to a high-voltage end of the dc circuit breaker through a high-voltage ignition ball, an auxiliary switch AB1 and a reactor 104. The direct-current circuit breaker is not considered as a whole to be tested in the loop, the energy absorption branch of the direct-current circuit breaker test sample cannot be connected in the test, and the loop and the method only check a main branch switch of the direct-current circuit breaker finally, cannot check the whole breaking performance of the direct-current circuit breaker test sample under all working conditions according to the direct-current running working conditions, and are insufficient in equivalence.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a system and a method for verifying the on-off performance of medium-low voltage direct current distribution switchgear, which can be used for checking the direct current switchgear under the full-voltage full-current working condition and meeting the equivalence and economical requirements of the on-off test of the direct current switchgear, thereby solving the problem that the existing test system and method can only check the current on-off capability but cannot check the medium strength recovery capability after the current is on-off.
The invention solves the problems through the following technical means:
a system for verifying the on-off performance of medium-low voltage direct current distribution switchgear comprises a current source, a voltage source, a test article, a current and voltage measuring system;
the current source comprises a direct current charging device 101, a charging switch 102, a current source capacitor bank 103, a current source reactor 104, a current source resistor 105, a current source discharging switch 201, a current source protection switch 202, a current source closing switch 203, a current source protection ball gap 204 and a current source protection lightning arrester 205;
the voltage source comprises a voltage source direct current power supply 305, a voltage source closing switch 304, a voltage source frequency modulation resistor 302 and a voltage source frequency modulation capacitor 303;
the test article is a tested direct current switch 401;
the current and voltage measuring system comprises a total voltage measuring device 107, a current source current measuring device 106, a voltage source current measuring device 301 and a total current measuring device 402;
in the current source, one end of a direct current charging device 101 is connected with a charging switch 102, and the other end is connected with a low potential of a current source capacitor bank 103; the other end of the charging switch 102 is connected with the high-voltage output end of the current source capacitor bank 103 and one end of the current source reactor 104; the other end of the current source reactor 104 is connected with one end of a current source resistor 105; the other end of the current source resistor 105 is connected with one end of the current source discharge switch 201 and one end of the current source protection switch 202 at the same time; the other end of the current source discharge switch 201 is connected with the low-voltage end of the tested direct current switch 401 and is grounded; the other end of the current source protection switch 202 is connected with the high-voltage end of the tested direct current switch 401 through the current source closing switch 203; one end of the current source protection spherical gap 204 and the current source protection lightning arrester 205 which are connected in parallel is connected with the high-voltage end of the tested direct current switch 401 through the current source closing switch 203, and the other end of the current source protection spherical gap is connected with the grounding end of the current source discharge switch 201; .
In the voltage source, the high-voltage end of a voltage source direct-current power supply 305 is connected with the high-voltage end of a tested direct-current switch 401 through a voltage source closing switch 304, and the low-voltage end is connected with the low-voltage end of the tested direct-current switch 401 and is grounded; one end of the voltage source frequency modulation resistor 302, which is connected with the voltage source frequency modulation capacitor 303 in series, is connected with the high-voltage end of the tested direct current switch 401, and the other end of the voltage source frequency modulation resistor 302, which is connected with the low-voltage end of the tested direct current switch 401, is connected with the ground;
in the current and voltage measuring system, the high-voltage end of a total voltage measuring device 107 is connected with the high-voltage end of a tested direct current switch 401, and the other end of the total voltage measuring device is connected with the ground; the current source current measuring device 106 is connected between the current source resistor 105 and the current source protection switch 202; the voltage source current measuring device 301 is connected between the voltage source closing switch 304 and the voltage source dc power source 305; the total current measuring device is connected between the low-voltage end of the tested direct current switch 401 and the ground.
The voltage source dc power supply 305 is a dc voltage generator and may be replaced by a charged capacitor bank.
The current source current measuring device 106, the voltage source current measuring device 301 and the total current measuring device 402 may be rogowski coils, shunts, hall CTs.
The total voltage measuring device 107 is a resistive-capacitive voltage divider, a resistive voltage divider, or a capacitive voltage divider.
The current source discharge switch 201 is connected in parallel with the current source capacitor bank 103, and has the function of closing the discharge switch to discharge the charge of the capacitor bank when the test is finished.
The current source protection switch 202 is used for controlling the protection switch to be turned on by time sequence control to cut off the short-circuit current when the test sample direct current switch can not cut off the short-circuit current, so that the test sample is prevented from being damaged by the long-term through current.
The current source closing switch 203 and the voltage source closing switch 304 are controllable power electronic devices (thyristors, IGBTs, IEGTs, IGCTs, etc.), vacuum switches, SF6 switches, ball gaps, etc.
The verification method of the system for verifying the switching-on and switching-off performance of the medium-low voltage direct current distribution switchgear comprises the following steps:
before the test, the tested direct current switch 401 is in a switch-on state, the current source capacitor bank 103 is charged completely, the voltage source direct current power supply 305 has the condition of outputting rated direct current voltage, the current source discharge switch 201 is switched off, the current source protection switch 202 is switched on, and the current source switch-on switch 203 and the voltage source switch-on switch 304 are both in a switch-off state;
the current source closing switch 203 is closed at the time of T1;
the dc switch 401 to be tested starts operating at time T2;
the current source protection switch 202 is opened at the time of T3;
the voltage source closing switch 304 is closed at the time of T4, and the whole test is completed;
wherein T1 is more than T2 and more than T3 and more than T4;
t2 is the moment when the sample direct current switch 401 receives a tripping instruction, T3 is 100 mus after the loop current reaches the expected breaking current of the test, and the time interval between T4 and T3 is 200 mus-500 mus;
the test result is read out through the total voltage measuring device 107 and the total current measuring device 402, the data measured by the total voltage measuring device 107 is the voltage at two ends of the tested direct current switch 401, the data measured by the total current measuring device 402 is the current flowing through the tested direct current switch 401, and the design requirement and the design criterion of the tested direct current switch 401 are compared according to the voltage and the current in the on-off process of the tested direct current switch 401, so that the actual on-off performance of the tested direct current switch 401 is judged, and whether the design requirement is met is judged.
After the whole test is finished, the discharge switch 201 is switched on, and residual charges on the current source capacitor bank 103 are discharged.
Compared with the prior art, the invention has the following advantages:
1. compared with the conventional method for testing the on-off performance, the method provided by the invention is added with the related structure and the test method for inspecting the medium recovery condition and the electric arc reignition condition, so that the method is more in line with the actual working condition and can obtain the real performance of the medium-low voltage direct current distribution point switch equipment;
2. the method has simple operation flow, can complete the operation process by means of digitization and automation, and has high efficiency and high speed compared with the traditional test mode;
3. the structure of the invention is simple and clear, and the used components are common equipment in the field of electrical engineering, so that the invention is convenient to process, manufacture and assemble and is suitable for popularization in the industry;
drawings
FIG. 1 is a system topology diagram of the present invention.
FIG. 2 is a waveform of a test without examining the recovery ability of medium strength.
Fig. 3 is a graph of the expected waveforms of a synthetic experiment with the introduction of a voltage source.
Schematic illustration of the test loop:
101, dc charging device 201: current source discharge switch 302: voltage source frequency modulation resistor
102: the charging switch 202: current source protection switch 303: voltage source frequency modulation capacitor
103: current source capacitor bank 203: current source closing switch 304: voltage source closing switch
104: the current source reactor 204: current source protection ball gap 305: voltage source DC power supply
105: current source resistor 205: current source protection lightning protection 401: DC switch to be tested
106: current source current measuring device 301: voltage source current measurement device 402: total current measuring device
107: total voltage measuring device
Detailed Description
As shown in fig. 1, a system for verifying the switching-on/off performance of a medium-low voltage direct current distribution switchgear comprises a current source, a voltage source, a test article, a current and voltage measuring system;
the current source comprises a direct current charging device 101, a charging switch 102, a current source capacitor bank 103, a current source reactor 104, a current source resistor 105, a current source discharging switch 201, a current source protection switch 202, a current source closing switch 203, a current source protection ball gap 204 and a current source protection lightning arrester 205;
the voltage source comprises a voltage source direct current power supply 305, a voltage source closing switch 304, a voltage source frequency modulation resistor 302 and a voltage source frequency modulation capacitor 303;
the test article is a tested direct current switch 401;
the current and voltage measuring system comprises a total voltage measuring device 107, a current source current measuring device 106, a voltage source current measuring device 301 and a total current measuring device 402;
in the current source, one end of a direct current charging device 101 is connected with a charging switch 102, and the other end is connected with a low potential of a current source capacitor bank 103; the other end of the charging switch 102 is connected to the high-voltage output end of the current source capacitor bank 103 and one end of the current source reactor 104; the other end of the current source reactor 104 is connected with one end of a current source resistor 105; the other end of the current source resistor 105 is connected with one end of the current source discharge switch 201 and one end of the current source protection switch 202 at the same time; the other end of the current source discharge switch 201 is connected with the low-voltage end of the tested direct current switch 401 and is grounded; the other end of the current source protection switch 202 is connected with the high-voltage end of the tested direct current switch 401 through the current source closing switch 203; one end of the current source protection sphere gap 204 which is connected with the current source protection lightning arrester 205 in parallel is connected with the high-voltage end of the tested direct current switch 401 through the current source closing switch 203, and the other end of the current source protection lightning arrester is connected with the grounding end of the current source discharge switch 201; .
In the voltage source, the high-voltage end of a voltage source direct-current power supply 305 is connected with the high-voltage end of a tested direct-current switch 401 through a voltage source closing switch 304, and the low-voltage end is connected with the low-voltage end of the tested direct-current switch 401 and is grounded; one end of the voltage source frequency modulation resistor 302, which is connected with the voltage source frequency modulation capacitor 303 in series, is connected with the high-voltage end of the tested direct current switch 401, and the other end of the voltage source frequency modulation resistor 302, which is connected with the low-voltage end of the tested direct current switch 401, is connected with the ground;
in the current and voltage measuring system, the high-voltage end of a total voltage measuring device 107 is connected with the high-voltage end of a tested direct current switch 401, and the other end of the total voltage measuring device is connected with the ground; the current source current measuring device 106 is connected between the current source resistor 105 and the current source protection switch 202; the voltage source current measuring device 301 is connected between the voltage source closing switch 304 and the voltage source direct current power supply 305; the total current measuring device is connected between the low-voltage end of the tested direct current switch 401 and the ground.
The voltage source dc power supply 305 is a dc voltage generator that may be replaced by a charged capacitor bank. The current measuring devices 106, 301, 402 may be rogowski coils, shunts, hall CTs.
The total voltage measuring device 107 is a resistive-capacitive voltage divider, a resistive voltage divider, or a capacitive voltage divider.
The discharge switch 201 is connected in parallel with the current source capacitor bank 103, and functions to close the discharge switch and discharge the charge of the capacitor bank when the test is finished.
The protection switch 202 is used for controlling the protection switch to be turned on by time sequence control to cut off the short-circuit current when the test sample direct current switch can not cut off the short-circuit current, so that the test sample is prevented from being damaged by the long-term through current.
The current source closing switch 203 and the voltage source closing switch 304 are controllable power electronic devices (thyristors, IGBTs, IEGTs, IGCTs, etc.), vacuum switches, SF6 switches, ball gaps, etc.
The system for verifying the on-off performance of the medium-low voltage direct current distribution switchgear comprises the following steps:
before the test, the tested direct current switch 401 is in a switch-on state, the current source capacitor bank 103 is charged completely, the voltage source direct current power supply 305 has the condition of outputting rated direct current voltage, the current source discharge switch 201 is switched off, the current source protection switch 202 is switched on, and the current source switch-on switch 203 and the voltage source switch-on switch 304 are both in a switch-off state;
the current source closing switch 203 is closed at the time of T1;
the dc switch 401 to be tested starts operating at time T2;
the current source protection switch 202 is opened at the time of T3;
the voltage source closing switch 304 is closed at the time of T4, and the whole test is completed;
wherein T1 is more than T2 and more than T3 and more than T4;
t2 is the moment when the sample direct current switch 401 receives the tripping command, T3 is the moment 100 mus after the loop current reaches the expected breaking current of the test, and the time interval between T4 and T3 should be between 200 mus and 500 mus.
The test results are read by the total voltage measuring device 107 and the total current measuring device 402. The total voltage measuring device 107 measures the voltage across the dc switch 401 under test, and the total current measuring device 402 measures the current flowing through the dc switch 401 under test. According to the voltage and the current in the on-off process of the tested direct current switch 401, the design requirement and the design criterion of the tested direct current switch 401 are compared, so that the actual on-off performance of the tested direct current switch 401 is judged, and whether the design requirement is met is judged.
After the whole test is finished, the discharging switch 201 is switched on, and residual charges on the current source capacitor bank 103 are discharged. The invention completes the examination of the complete on-off performance of the medium and low voltage direct current distribution switch equipment through the reasonable time sequence setting and the coordination of the equipment action sequence.
Fig. 2 shows waveforms of the medium strength recovery capability which are not examined, and the waveforms only show that the current breaking test is performed on the tested direct current switch, and the condition that the recovery voltage is applied to two ends of the direct current switch after the current breaking is not examined. In practical engineering application, after the direct current switch is switched off, system recovery voltage is immediately applied to two ends of the direct current switch, and if the medium strength recovery speed is low and the recovery strength is insufficient, the direct current switch is likely to be punctured to cause reignition of electric arcs, so that serious line faults are brought. The test procedure shown in fig. 2 does not correspond to the actual engineering situation, and therefore there is a distortion of the result of the disconnection, and the test method is to be improved and optimized.
FIG. 3 shows the expected waveform of the synthetic experiment with the voltage source applied. The oscillogram shows that the system suitable for verifying the on-off performance of the medium-low voltage direct current distribution switch equipment is adopted, the step of applying the system to verify the on-off performance of the medium-low voltage direct current distribution switch equipment is adopted, and a voltage U is introduced into two ends of a tested direct current switch at the moment of T4 on the basis of a tested direct current switch on-off current test to test whether the tested direct current switch fails to be turned on or off. The method is closer to the actual engineering.
The system using process and the performance judging method for verifying the switching-on/off performance of the medium-low voltage direct current distribution switchgear are illustrated. A certain type 1500V compressed air direct current circuit breaker has the characteristic of higher arc voltage when the short-circuit current is cut off. The maximum short-circuit current of a system applied by the circuit breaker is 100kA (time constant is 10 ms), the maximum working voltage of the system is 1800V, and the time for switching on and off the maximum short-circuit current is not more than 10ms. The system for verifying the switching performance is adopted to test the switching capacity of the direct current breaker, the current source capacitor bank 103, the current source reactor 104 and the current source resistor 105 are firstly adjusted to be in accordance with the matching parameters of the short-circuit time constant, and the proper charging voltage of the direct current charging device 101 is selected to generate the maximum short-circuit current requirement of the system. Regulated voltage source dc power supply 305 outputs a voltage of 1800V. The test dc breaker was mounted as the test dc switch 401, and the test was started. The test is carried out according to the test mode, wherein the T1 time is selected to be 0 time, the T2 time is selected to be 1ms, the T3 time is selected to be 5ms, and the T4 time is selected to be 5.5ms. And reading the values of the total current measuring device 402 and the total voltage measuring device 107 after the test is finished, obtaining the expected peak current of the DC breaker when the DC breaker is switched on and off, wherein the switching-on and switching-off time is less than 10ms, and the recovery voltage after the DC breaker is switched on and switched off is 1800V, and the arc reignition does not occur, so that the 1500V DC breaker meets the design requirement and passes the performance test.
Claims (6)
1. A system for verifying the on-off performance of medium-low voltage direct current distribution switchgear is characterized by comprising a current source, a voltage source, a test article, a current and voltage measuring system;
the current source comprises a direct current charging device (101), a charging switch (102), a current source capacitor bank (103), a current source reactor (104), a current source resistor (105), a current source discharging switch (201), a current source protection switch (202), a current source closing switch (203), a current source protection ball gap (204) and a current source protection lightning arrester (205);
the voltage source comprises a voltage source direct-current power supply (305), a voltage source closing switch (304), a voltage source frequency modulation resistor (302) and a voltage source frequency modulation capacitor (303);
the test article is a tested direct current switch (401);
the current and voltage measuring system comprises a total voltage measuring device (107), a current source current measuring device (106), a voltage source current measuring device (301) and a total current measuring device (402);
in the current source, one end of a direct current charging device (101) is connected with a charging switch (102), and the other end of the direct current charging device is connected with a low potential of a current source capacitor bank (103); the other end of the charging switch (102) is simultaneously connected with the high-voltage output end of the current source capacitor bank (103) and one end of the current source reactor (104); the other end of the current source reactor (104) is connected with one end of a current source resistor (105); the other end of the current source resistor (105) is simultaneously connected with one ends of the current source discharge switch (201) and the current source protection switch (202); the other end of the current source discharge switch (201) is connected with the low-voltage end of the tested direct current switch (401) and is grounded; the other end of the current source protection switch (202) is connected with the high-voltage end of the tested direct current switch (401) through a current source closing switch (203); one end of the current source protection ball gap (204) which is connected with the current source protection lightning arrester (205) in parallel is connected with the high-voltage end of the tested direct current switch (401) through the current source closing switch (203), and the other end of the current source protection ball gap is connected with the grounding end of the current source discharge switch (201);
in the voltage source, the high-voltage end of a voltage source direct current power supply (305) is connected with the high-voltage end of a tested direct current switch (401) through a voltage source closing switch (304), and the low-voltage end of the voltage source direct current power supply is connected with the low-voltage end of the tested direct current switch (401) and is grounded; one end of the voltage source frequency modulation resistor (302) which is connected with the voltage source frequency modulation capacitor (303) in series is connected with the high-voltage end of the tested direct current switch (401), and the other end of the voltage source frequency modulation resistor is connected with the low-voltage end of the tested direct current switch (401) and is grounded;
in the current and voltage measuring system, the high-voltage end of a total voltage measuring device (107) is connected with the high-voltage end of a tested direct current switch (401), and the other end of the total voltage measuring device is connected with the ground; the current source current measuring device (106) is connected between the current source resistor (105) and the current source protection switch (202); the voltage source current measuring device (301) is connected between the voltage source closing switch (304) and the voltage source direct current power supply (305); the total current measuring device is connected between the low-voltage end of the tested direct current switch (401) and the ground.
2. A system for verifying the breaking performance of medium-low voltage dc distribution switchgear according to claim 1, characterized in that said voltage source dc power source (305) uses a dc voltage generator or a charged capacitor bank.
3. A system for verifying the switching performance of a medium-low voltage dc distribution switchgear according to claim 1, characterized in that said current source current measuring device (106), voltage source current measuring device (301) and total current measuring device (402) are implemented as rogowski coils, shunts or hall CTs.
4. A system for verifying the turn-off behavior of a medium-low voltage dc distribution switchgear according to claim 1, characterized in that the total voltage measuring means (107) is implemented as a resistor-capacitor voltage divider, a resistor voltage divider or a capacitor voltage divider.
5. A method for verifying the system for verifying the cut-off performance of a medium-low voltage direct current distribution switchgear according to any one of claims 1 to 4, characterized in that it comprises the following steps:
before a test, a tested direct current switch (401) is in a switching-on state, a current source capacitor bank (103) is charged completely, a voltage source direct current power supply (305) has a condition of outputting rated direct current voltage, a current source discharging switch (201) is switched off, a current source protection switch (202) is switched on, and a current source switching-on switch (203) and a voltage source switching-on switch (304) are both in a switching-off state;
a current source closing switch (203) is closed at the time T1;
starting the operation of the tested direct current switch (401) at the time T2;
the current source protection switch (202) is switched off at the time of T3;
switching on a voltage source switching-on switch (304) at the time of T4 to finish the whole test;
wherein T1 is more than T2 and more than T3 and more than T4;
t2 is the moment when the tested direct current switch (401) receives a tripping command, T3 is 100 mus after the loop current reaches the expected breaking current of the test, and the time interval between T4 and T3 is 200 mus-500 mus;
the test result is read out through a total voltage measuring device (107) and a total current measuring device (402), data measured by the total voltage measuring device (107) are voltages at two ends of the tested direct current switch (401), data measured by the total current measuring device (402) are currents flowing through the tested direct current switch (401), and the design requirement and the design criterion of the tested direct current switch (401) are compared according to the voltages and the currents in the switching-on and switching-off processes of the tested direct current switch (401), so that the actual switching-on and switching-off performance of the tested direct current switch (401) is judged, and whether the design requirement is met is judged.
6. The verification method of claim 5, wherein after the entire test is completed, the current source discharge switch (201) is closed to discharge the residual charge on the current source capacitor bank (103).
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